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ADIS16489 Datasheet(PDF) 20 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 40 page  ADIS16489 Data Sheet Rev. B | Page 20 of 40 Table 54. BAROM_OUT Register Definition Page Addresses Default Access Flash Backup 0x00 0x30, 0x31 Not applicable R No Table 55. BAROM_OUT Bit Definitions Bits Description [15:0] Barometer data; high word; twos complement, ±1.31 range; 0 bar = 0x0000, 1 LSB = 40μbar The BAROM_LOW (see Table 52 and Table 53) and BAROM_ OUT (see Table 54 and Table 55) registers contain the barometer data. Barometer Resolution Table 56 and Table 57 offer various numerical examples that demonstrate the format of the pressure (barometer) data in both 16-bit and 32-bit formats. Table 56. 16-Bit Barometer Data Format Examples Pressure Decimal Hex Binary +1.31068 bar +32767 0x3FFF 0111 1111 1111 1111 +80 μbar +2 0x0002 0000 0000 0000 0010 +40 μbar +1 0x0001 0000 0000 0000 0001 0 0 0x0000 0000 0000 0000 0000 −40 μbar −1 0xFFFF 1111 1111 1111 1111 −80 μbar −2 0xFFFE 1111 1111 1111 1110 −1.31072 −32768 0x4000 1000 0000 0000 0000 Table 57. 32-Bit Barometer Data Format Examples Pressure Decimal Hex +1.31068 bar +4,294,967,295 0x3FFFFFFF +80 μbar ÷ 216 +2 0x00000002 +40 μbar ÷ 216 +1 0x00000001 0 0 0x00000000 −40 μbar ÷ 216 −1 0xFFFFFFFF −80 μbar ÷ 216 −2 0xFFFFFFFE −1.31072 −4,294,967,296 0x40000000 DELTA ANGLES In addition to the angular rate of rotation (gyroscope) measure- ments around each axis (x, y, and z), the ADIS16489 also provides delta angle measurements that represent a computation of angular displacement between each sample update. PIN 1 PIN 23 ΔΘY Y-AXIS ΔΘX X-AXIS Z-AXIS ΔΘZ Figure 23. Delta Angle Axis and Polarity Assignments The delta angle outputs represent an integration of the gyro- scope measurements and use the following formula for all three axes (x-axis displayed): ( ) , ,, D x nD x nD d x nD d d S f θ ωω − + +− = ∆ = × + ∑ 1 1 0 1 2 where: D is the decimation rate = DEC_RATE + 1 (see Table 159). fS is the sample rate. d is the incremental variable in the summation formula. ωx is the x-axis rate of rotation (gyroscope). n is the sample time, prior to the decimation filter. When using the internal sample clock, fS is equal to 2460 SPS. When using the external clock option, fS is equal to the frequency of the external clock. The external clock frequency must be at least 700 Hz to prevent overflow in the delta angle data registers at high rotation rates. Each axis of the delta angle measurements has two output data registers. Figure 24 illustrates how these two registers combine to support a 32-bit, twos complement data format for the x-axis delta angle measurements. This format also applies to the y- and x-axes as well. X-AXIS DELTA ANGLE DATA 0 15 15 0 X_DELTANG_OUT X_DELTANG_LOW Figure 24. Delta Angle Output Data Structure X-Axis Delta Angle (X_DELTANG_LOW, X_DELTANG_OUT) Table 58. X_DELTANG_LOW Register Definitions Page Addresses Default Access Flash Backup 0x00 0x40, 0x41 Not applicable R No Table 59. X_DELTANG_LOW Bit Definitions Bits Description [15:0] X-axis delta angle data; low word Table 60. X_DELTANG_OUT Register Definitions Page Addresses Default Access Flash Backup 0x00 0x42, 0x43 Not applicable R No Table 61. X_DELTANG_OUT Bit Definitions Bits Description [15:0] X-axis delta angle data; twos complement, ±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022° The X_DELTANG_LOW (see Table 58 and Table 59) and X_DELTANG_OUT (see Table 60 and Table 61) registers contain the delta angle data for the x-axis. |
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